未命名 1

圖示收斂無窮等比級數和(2)

$\large\frac{1}{4}+($$\large\frac{1}{4})^2+($$\large\frac{1}{4})^3+($$\large\frac{1}{4})^4+...=$$\large\frac{1}{3}$

$\large\frac{1}{8}+$$\large\frac{1}{2}\times(\frac{1}{8})+(\frac{1}{2})^2\times(\frac{1}{8})+(\frac{1}{2})^3\times(\frac{1}{8})+(\frac{1}{2})^4\times(\frac{1}{8})+(\frac{1}{2})^5\times(\frac{1}{8})+...=$$\large\frac{1}{4}$

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